linux-kernel - Re: replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <E1LolUc-0003kM-FU@be1.7eggert.dyndns.org>
Date:	Tue, 31 Mar 2009 23:27:33 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Pavel Machek <pavel@....cz>, Artem Bityutskiy <dedekind@...dex.ru>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: replace() system call needed (was Re: EXT4-ish "fixes" in 	UBIFS)

Pavel Machek <pavel@....cz> wrote:

> My proposal is
> 
> rename() stays.
> 
> replace(src, bar) is rename that ensures that bar will contain valid
> data after powerfail.

This can be done using implicit logic:

->E.g. on close(), mark inodes without being sync()ed as poisoned.
(I can think of more sophisticated logic, but ...)
->On completing the inode with the delayed allocations, unpoison it.
->Don't commit rename()s if the corresponding inode is poisoned.

Et Voila, everything replace is supposed to guarantee is guaranteed.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/